Taxonomy virus Flashcards

1
Q

virus are grouped in ?

A

families

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2
Q

virus are given what to name them?

A
  • Genus name

- Species name

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3
Q

classification of virus is based on what ?

A
  • Nature of the host
  • Type of disease caused
  • Life cycle
  • Naked or enveloped
  • Type of nucleic acids and strandedness
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4
Q

What’s the baltimore classficiation scheme?

A

the type of genome , kind of genome will dictate the replication mechanism

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5
Q

There are two type of RNA genomes

A
  • Plus configuration

- Minus configuration

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6
Q

What’s the plus configuration of RNA genomes?

A

It’s the same strand of dna and can be translated directly

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7
Q

What’s the minus configuration of RNA genomes?

A

complementary in base sequence to viral mRNA (needs to be transcribed into plus strand before it can be translated

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8
Q

Life cycle of viruses ,first step?

A

Adsorption

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9
Q

What’s adsorption ?

A

attachment - virus - specific receptors- surface of the cell.

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10
Q

plants viruses are usually introduced into the host by ?

A

insect vectors or following mechanical damage

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11
Q

life cycle of viruses,second step?

A

Penetration,virus genome enters the cell

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12
Q

in envelopped and naked viruses what enters the cell ?

A

complete virion may enter the cell

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13
Q

In envelopped virus, the envelope may?

A

be left at the cell surface such that only the nucleopsid enters the cell

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14
Q

In naked viruses?

A

the capsid may be left at the surface(everything left at the surface)

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15
Q

Uncoating?

A

removal of the envelope and/or the capsid by host enzymes,sometimes within lysosomes(in eukaryotes)

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16
Q

direct penetration?

A

naked virus,everything is left at the surface

17
Q

In membrane fusion ? (enveloped viruses)

A

the envelope is left at surface

18
Q

Who does endocytosis to enter

A

Most enveloped viruses of eukaryotes (they use viropexis)

19
Q

What’s viropexis?

A

Everything gets in (in a second envelope)

20
Q

What happens with the second envelope that goes in ?

A

viruses are then delivered to lysosomes which degrade the capsid and the nucleic acid is release into the cytoplasm

21
Q

Life cycle, third step?

A

replication of the nucleic acid transcription and protein synthesis

22
Q

life cycle,fourth step?

A

Maturation, assembly of virus components,nucleic acid,nucleocapsid and acessory proteins to form new virions

23
Q

How quick happens the assembly?

A

spontaneous (occurs by itself)

24
Q

LIfe cycle, fifth step?

A

release,matura virions exit the host cell by means of budding or by causin lysis of the cell

25
Q

When the plant viruses exit it’s transmitted by?

A

by means of vector

26
Q

2 importante période dans le virus replication?

A
  • Latent period

- Release(Rise period)

27
Q

Latent period diviser en deux ?

A
  • Eclipse

- Maturation

28
Q

What’s Eclipse?

A

time necessary for the host cells to replicate the viral genome and to synthesize the viral component

29
Q

What’s maturation ?

A

time needed for the different components to be assembled

30
Q

What happens during release?

A

Virions are detected outside the cell

31
Q

virions detected outside?

A

il vont les detecter et donc vont liberer les siens

32
Q

Apres qu’il est détecté des virions dehors ils font quoi?

A

Lysis: virus-encoded proteins damage the cytoplasmic membrane”

33
Q

ds les bacterie c quoi qui cause lysis ?

A

a virus encoded protein destroys the peptidoglycan layer

34
Q

aussi peuvent etre liberer par ?

A

Budding (enveloped virus)

35
Q

the number of virions released?

A

burst size

36
Q

Burst size varies ?

A

according to the virus,host cell

37
Q

Tout ce processus prend combien de temps pour une bacterial virus?

A

20-60 min

38
Q

Tout ce processus prend combien de temps pour un animal virus ?

A

8-40h

39
Q

budding the enveloppe comes from?

A

the cytoplasmic membrane or the nuclear membrane